. illinois democrat dick durbin and arizona republican jeff flake. >> ifill: then we turn to conflicts in three places around the world beginning with a renewed wave of unrest in egypt that's left more than 50 people dead. >> woodruff: from israel margaret warner reports on fears of islamic militants and chemical weapons just over the border. >> warner: with conflict raging inside syria, israel's taking no chances. it's now fortifying the security barrier behind me to guard against any dangers that may arise. >> ifill: and from mali, lindsay hilsum has a story of celebration as french and local forces push north to capture two key towns.